Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 74.8°F (23.8°C) in August to a comfortable 67.6°F (19.8°C). Williamstown observes an average low-temperature of 48°F (8.9°C) during September nights.Humidity
The average relative humidity in September in Williamstown is 81%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.1 days and typically collects 2.09" (53mm) of precipitation.Snowfall
In Williamstown, Vermont, snow does not fall in June through September.Daylight
In September, the average length of the day in Williamstown is 12h and 30min.On the first day of the month, sunrise is at 6:14 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:32 pm EDT.
Sunshine
The average sunshine in September is 8h.UV index
In Williamstown, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 3 in September leads to these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What is the average September temperature in Williamstown?
What is the average humidity in September in Williamstown?
What is the driest month in Williamstown?
How many days does it rain in September in Williamstown?
When it does not snow in Williamstown?
Does it snow in Williamstown in September?
What is the average length of the day in September in Williamstown?
When are sunrise and sunset in September in Williamstown?
How long on average sun shines in September in Williamstown?
How high is the UV index in September in Williamstown?
Average temperature in September
Williamstown, VT
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is January (23.2°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Williamstown, VT
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Williamstown, VT
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Williamstown, VT
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Williamstown, VT
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is September (2.09").
Average rainfall days in September
Williamstown, VT
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Williamstown, VT
- Average snowfall in September: 0"
The month with the highest snowfall is February (13.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Williamstown, VT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (22.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Williamstown, VT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).
Average sunshine days in September
Williamstown, VT
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is September (14.6 days).
The month with the least sunshine days is February (5.5 days).
Average UV index in September
Williamstown, VT
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Williamstown, VT
- Average cloud cover in September: 43
The months with the most cloud cover are January and February (Cloud cover 74).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in September
Williamstown, VT
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March and December (4mi).
Williamstown, Vermont, USA
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